Patent US3502186A successfully refreshed from Google Patents.
US2981636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colored roofing granules
Assignee: 3M Co
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Filing: 1957-02-18
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Granted: 1961-04-25
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Expires: 1977-02-18
Abstract
No abstract record available.
Inventors
- 👤 James R Lodge
- 👤 George W Swenson
- 👤 Donald L Reichel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:28
CPC Classifications
E; E04; E04D; E04D7/00; E04D7/005; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
THE METHOD OF COLORING GRANULES OF THE CHARACTER DESCRIBED WHICH COMPRISES APPLYING A COATING OF A HYDROUS PLASTIC CLAY, A PIGMENT IN AN AMOUNT INSUFFICIENT TO PROVIDE THE DESIRED COLOR INTENSITY IN THE GRANULE COATING AND SODIUM SILICATE, RTEACTING SAID CLAY AND SILICATE AT TEMPERATURES OF THE ORDER OF 950*-1000*F., AND APPLYING DIRECTLY UPON THE OUTER SURFACE OF SAID CLAY-SILICATE COAT-
Claim 2
Independent Claim
61 words
THE METHOD OF COLORING GRANULES OF THE CHARACTER DESCRIBED WHICH COMPRISES APPLYING A COATING OF A HYDROUS PLASTIC CLAY, A PIGMENT IN AN AMOUNT INSUFFICIENT TO PROVIDE THE DESIRED COLOR INTENSITY IN THE GRANULE COATING AND SODIUM SILICATE, RTEACTING SAID CLAY AND SILICATE AT TEMPERATURES OF THE ORDER OF 950*-1000*F., AND APPLYING DIRECTLY UPON THE OUTER SURFACE OF SAID CLAY-SILICATE COAT-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |